若的解析式为（   ）

阅读短文，选择正确的答案。
    A little mouse thought he was the tallest and strongest animal in the world. His mother said to him, "Don't say that in front of an elephant. He doesn't like that." The little mouse didn't listen to his mother. He went out to look for the elephant, but he didn't know who the elephant was. He asked an ant(蚂蚁) first, "Are you an elephant?" "No, I'm not," said the ant. "An elephant is much bigger than I am." Suddenly(突然), he saw four big trees. "Let me climb up(爬上) a tree. Then I can see where the elephant is," said the little mouse. "Get down! Get down!" someone shouted(喊) to him. "I'm the elephant. Go and climb that tall tree nearby. Then you can see me." "Now, I see. The elephant is the tallest and strongest animal in the world," said the little mouse.

普罗塔戈拉曾说：“至于神，我既不能说他们存在，也不能说他们不存在，因为阻碍我认识这一点的事情很多，例如问题晦涩，人寿短促。”对此材料理解正确的是（    ）

不良诱惑就像小小的“吸血蝙蝠”，静静地靠近你，慢慢地腐蚀你。这表明，不良诱惑（     ）

据文字记载，我们的祖先在神农氏时代就开始利用海水晒盐。海水晒盐的原理是（    ）